M=mute_smoothedunmute_fract32_module(NAME, INITIALSTATE)
 Creates a smoothly varying scalersmoothed object for use in the
 Audio Weaver module which mutes, remains silent, and then unmutes
 after a period of time.  This is used to hide artifacts.  The
 module has programmable mute, unmute, and silence periods.  The
 muting and unmuting is performed using raised cosine windows.
 Arguments:
    NAME - name of the module.
    INITIALSTATE - optional argument which specifies the default state
      of the trigger variable.  By default, INITIALSTATE = 0 meaning that
      the module comes up unmuted.